Comment by tetha
5 hours ago
But it did not take 2 threads within the same application to interact in a bad way on data the system controlled to cause this problem.
This reads more like an overly broad transition in a deterministic state machine. The fix was to split up a bad transition to shutdown.
Concurrency bugs don't have to be within a single process.
By that definition, every write() call that doesn't check for EAGAIN is a concurrency bug you're racing the disk controller. The term stops meaning anything.